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Android官方下拉刷新控件SwipeRefreshLayout使用详解

2019-12-12 05:51:58
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可能开发安卓的人大多数都用过很多下拉刷新的开源组件,但是今天用了官方v4支持包的SwipeRefreshLayout觉得效果也蛮不错的,特拿出来分享。

简介:
SwipeRefreshLayout组件只接受一个子组件:即需要刷新的那个组件。它使用一个侦听机制来通知拥有该组件的监听器有刷新事件发生,换句话说我们的Activity必须实现通知的接口。该Activity负责处理事件刷新和刷新相应的视图。一旦监听者接收到该事件,就决定了刷新过程中应处理的地方。如果要展示一个“刷新动画”,它必须调用setRefrshing(true),否则取消动画就调用setRefreshing(false)。 

并且这个东西只支持下拉刷新,大家可以自定义View继承它实现你的上拉加载。 

怎样使用SwipeRefreshLayout:

使用起来非常简单。

下面将用一个实例展示如何使用官方这个下拉刷新控件,末尾我还模仿虚拟实现了一个小的上拉加载效果,可以供大家向上分析。 

先上图: 

上点代码:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.nanchen.swiperefreshlayoutdemo.MainActivity"> <android.support.v4.widget.SwipeRefreshLayout  android:id="@+id/main_srl"  android:layout_width="wrap_content"  android:layout_height="wrap_content">  <ListView   android:id="@+id/main_lv"   android:layout_width="wrap_content"   android:layout_height="wrap_content">  </ListView> </android.support.v4.widget.SwipeRefreshLayout></RelativeLayout>

menu_layout.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"> <ProgressBar  style="?android:attr/progressBarStyleSmall"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:id="@+id/progressBar"/> <TextView  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="正在玩命加载中...."  android:id="@+id/textView2"/></LinearLayout>

MainActivity.java 

package com.example.nanchen.swiperefreshlayoutdemo;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.support.v4.widget.SwipeRefreshLayout;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.AbsListView;import android.widget.ArrayAdapter;import android.widget.ListView;import java.util.ArrayList;import java.util.Arrays;import java.util.List; public class MainActivity extends AppCompatActivity implements AbsListView.OnScrollListener { private SwipeRefreshLayout swipeRefreshLayout; private ListView lv; private ArrayAdapter adapter; private List<String> list; private View footerView; private Handler handler = new Handler(){  @Override  public void handleMessage(Message msg) {   super.handleMessage(msg);   switch (msg.what){    case 0x101:     if (swipeRefreshLayout.isRefreshing()){      adapter.notifyDataSetChanged();      swipeRefreshLayout.setRefreshing(false);//设置不刷新     }     break;   }  } }; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.main_srl);  lv = (ListView) findViewById(R.id.main_lv);  footerView = getLayoutInflater().inflate(R.layout.loading_layout,null);  lv.addFooterView(footerView);  lv.setOnScrollListener(this);  list = new ArrayList<>();  list.addAll(Arrays.asList("Java","php","C++","C#","IOS","html","C","J2ee","j2se","VB",".net","Http","tcp","udp","www"));  adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,  android.R.id.text1,list);  lv.setAdapter(adapter);  swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light,   android.R.color.holo_orange_light, android.R.color.holo_red_light);  swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {   @Override   public void onRefresh() {    new LoadDataThread().start();   }  }); } private int visibleLastIndex;//用来可显示的最后一条数据的索引 @Override public void onScrollStateChanged(AbsListView view, int scrollState) {  if(adapter.getCount() == visibleLastIndex && scrollState == SCROLL_STATE_IDLE){   new LoadDataThread().start();  } }  @Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {  visibleLastIndex = firstVisibleItem + visibleItemCount - 1;//减去最后一个加载中那条 } /**  * 模拟加载数据的线程  */ class LoadDataThread extends Thread{  @Override  public void run() {   initData();   try {    Thread.sleep(2000);   } catch (InterruptedException e) {    e.printStackTrace();   }   handler.sendEmptyMessage(0x101);//通过handler发送一个更新数据的标记  } private void initData() {   list.addAll(Arrays.asList("Json","XML","UDP","http"));  } }} 

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持武林网。

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